NTAK20 Clock Controller daughterboard Page 731 of 894

backplane line. It designates the DTI/PRI motherboard as a primary reference source. The secondary reference is obtained from another DTI/PRI card, which is designated by a technician. No other clock sources are used.

External timing interface

The clock controller provides an external timing interface and accepts two signals as timing references. An external reference is an auxiliary timing clock which is bridged from a traffic carrying signal and is not intended to be a dedicated non-traffic-bearing timing signal. The clock controller uses either the external/auxiliary references or the DTI/PRI references.

Hardware integrity and regulatory environment

The clock controller complies with the following hardware integrity and regulatory specifications:

Item

Specification

 

 

EMI

FCC part 15 sub- part J

 

CSA C108.8

 

CISPR publication 22

 

 

ESD

IEC 801-2

 

 

Temperature

IEC 68-2-1

 

IEC 68-2-2

 

IEC 68-2-14

 

 

Humidity

IEC 68-2-3

 

 

Vibration/Shock

IEC 68-2-6

 

IEC 68-2-7

 

IEC 68-2-29

 

IEC 68-2-31

 

IEC 68-2-32

 

 

Circuit Card Description and Installation

Page 731
Image 731
Nortel Networks 553-3001-211 manual External timing interface, Hardware integrity and regulatory environment, Emi, Esd